High-resolution multibeam bathymetric and seismic data enables a detailed morphological investigation of a submarine canyon (West Penghu Canyon) on the northeastern South China Sea margin, where twenty-three (23) scours are observed along the canyon thalweg. These scours form narrow topographic depressions in plan view and show asymmetrical morphologies in cross-section. The identified scours can be further divided into two groups (Types A and B) based on their sizes and relative locations. They are separated by a slope break at a water depth of ~2850 m. Type A scours (S1-S18) occur upslope from the slope break, whereas Type B scours (S19-S23) lie downslope from this same break. The scours are interpreted as net-erosional cyclic steps associated with turbidity currents flowing through the West Penghu Canyon; the currents that form Type A scours reflect higher V, Q, and Δ_el compared to the currents forming Type B scours. A change in slope gradient and loss of lateral confinement are proposed to control the change from Type A to Type B scours. Furthermore, Coriolis force influences the flow direction of turbidity currents, leading to the preferential development and larger incision depths of scours towards the southwestern flank of the West Penghu Canyon. Our results contribute to a better understanding on the origin of scours in submarine canyons across the world.

高分辨率的多波束测深和地震数据使得能够对南海东北缘的海底峡谷（西澎湖峡谷）进行详细的形态学研究，沿海藻峡谷观察到了二十三（23）个冲刺。这些冲刷在平面图中形成狭窄的地形凹陷，并在横截面上显示出不对称的形态。根据其大小和相对位置，可以将已识别的冲刷进一步分为两组（类型A和B）。它们在〜2850 m的水深处被斜坡折断分开。A型冲刷（S1-S18）发生在斜坡断裂处的上坡，而B型冲刷（S19-S23）发生在同一断裂处的下坡。这些冲刷被解释为与流经西澎湖峡谷的浊流相关的净侵蚀循环阶跃。_EL相比形成B型腹泻的电流。为了控制从A型到B型冲刷的变化，提出了改变坡度和减少侧向约束的建议。此外，科里奥利力会影响浊流的流动方向，从而导致优先发展，并且向西澎湖峡谷西南翼的冲刷切口深度更大。我们的结果有助于更好地了解世界各地海底峡谷的冲刷成因。